Lighting fixture arm



FIG. 1 is a perspective view of the lighting fixture arm thereof;

FIG. 2 is a left side elevational view thereof, rear elevational view being a mirror image; and,

FIG. 3 is a front elevational view thereof.

The broken-line showing of environmental structures in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a lighting fixture arm, as shown and described. 